Answer: The symbol of diphosphate ion is [tex]P_2O_7^{4-}[/tex]
Explanation:
An ionic compound is defined as the compound which is formed when electron gets transferred from one atom to another atom.
These are usually formed when a metal reacts with a non-metal or a metal reacts with a polyatomic ion or a reaction between two polyatomic ions takes place.
Calcium diphosphate [tex](Ca_2P_2O_7)[/tex] is formed by the combination of calcium ions [tex](Ca^{2+})[/tex] and diphosphate ions [tex](P_2O_7^{4-})[/tex]
By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral ionic compound.
Hence, the symbol of diphosphate ion is [tex]P_2O_7^{4-}[/tex]
